Korean Problem Academy / Erratum

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Black to Kill
How to continue this solution?
Another solution
One point worse

Level 2, [ext] Problem 178

I have a question concerning problem 178 on the 15k-5k level from the Korean Problem Academy problems, available on GoBase.

The position is shown here:

[Diagram]

Black to Kill

[Diagram]

How to continue this solution?

The solution given at gobase is B1. But I cannot find the proper answer to W2. After B3, white plays W4 and lives.



Level 3, [ext] Problem 108

[Diagram]

Another solution

This is better than the given solution. Black gives up one stone, but leaves behind a two point gote to capture two White stones. Instead of 3 points of territory the count is 4 points (plus or minus 2 for the gote). Black is also better in terms of ko threats.

(LukeNine45: Bill, hope you don't mind my re-wording... :) )



LukeNine45: Unfortuniately, I got the diagram wrong. The WC stone above changes things:

[Diagram]

One point worse

Bill: With the WC stone, your solution is one point worse than the given solution. The point you gain giving one stone for a potential two stones is given back with W4 - B5. In addition, with the usual assumption that the surrounding area is White territory, you have lost the one point sente at B4. Still, it deserves honorable mention. :-)


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